We have four dd 13 in july dd11 dd 28 months that took 5 years of trying for and ds14 months the surprise package.
Yes the house is always messy, the washer always on, always clothes to put away. The house is never quiet.
The older two always bicker.
It's not the babies that make days out expensive its the older two, had to pay adult prices at disney and parc asterix this year for the older one and she wants adult meals when we go out.
Clothes and shoes are expensive. but hey that would be the same if only three or two of them.
Think it depends as well whether you have to go out to work and how much dh helps out.
As for the pregnancy thing i think you just get on with it. dd was only 5 months old when i got pregnant again, although i was devestated as i already had a baby and didnt want another one i think i breezed through, yes i was tired but not as bad as time before actually, maybe that was because i was in denial. (who knows)
I's actually dh that is having more difficulty in dealing with it all at the moment, says house is always noisey and explodes at the slightest thing.
But they are precious and i'm sure you'll cope. God for it their a joy but be prepared for everything to be manic unless you are organised which i'm not
Also another thing that is difficult is that hotel rooms are usually for four, you dont often find a table for 6 in a cafe, services etc.